Windows 10 KB5120249 cumulative update released with fixes

Microsoft has released the Windows 10 KB5120249 Extended Security Updates (ESU) for versions 22H2 and 21H2 to fix security vulnerabilities and bugs.

Today's update is mandatory as it contains the August 2026 Patch Tuesday security updates.

You can install today's update by going to Start > Settings > Update & Security > Windows Update and clicking on 'Check for updates.'

You can also manually download and install the update from the Microsoft Update Catalog.

After installing today's update, Windows 10 will be updated to OS Builds 19045.7663 and 19044.7663.

With today's update, Microsoft is fixing a File History backup issue and expanding the rollout of new Secure Boot certificates.

Here's the full list of improvements and fixes:

Microsoft also said that Secure Boot certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.